title: Late response vs. non-response to mail questionnaire.
authors.forename: K
authors.initials: K
authors.lastname: Sheikh
mesh_terms: D015982:Bias; D006306:Health Surveys; D006801:Humans; D010352:Patient Dropouts / Q000523:psychology*; D015203:Reproducibility of Results; D012107:Research Design / Q000592:standards*; D011795:Surveys and Questionnaires / Q000592:standards*